Rotational device such as vehicle wheels



Nov. 26, 1929.. J. v. PUGH ET AL ROTATIONAL DEVICE SUCH AS VEHICLE WHEELS Filed Oct. 27, 1926 3 Sheets-Sheet Nov. 26, 1929.

J. V. PUGH ET AL ROTATIONAL DEVICE SUCH AS VEHICLE WHEELS Filed Oct. 2'7. 1926 3 Sheets-Sheet 2 /n ven/or-s ohn a h and Gi/bar/ 7. B y/1's; M PM- Nov. 26, 1929. J. v. PUGH ET AL ROTATIONAL DEVICE SUCH AS VEHICLE WHEELS Filed Oct. 27, 1926 5 Sheets-Sheet f5 MM 3% J ca ,7 W? W 3 l w AZ 5 w,

Patented Nov. 26, 1929 UNITED STATE PATENT OFFICE 4.10m vamron we: smear 'rnoiras 'BAYLIss, or covmrrmr, ENGLAND,

assrenoas 'ro BIDGE-WHITWOBTH, Lmn'nn, or covmnrmz, {ENGLAND BOTATIONAL DEVICE SUCH AS VEHICLE WHEELS Application filed October 27, 1926, Serial N0. 144,615, and in Great Britain November 8, 1825.

This invention relates to the attachment of rotational elements which are connected so as to revolve in unison with axles, shafts, wheel hubs or the like.

5 To'secure joint rotation of two arts, keys, splines and corrugations, pegs, b ts and like en aging means have been employed and in atents Nos. 1,424,211 and 1,609,67 various forms of such engaging means are set forth.

I .The attachment of demountable wheel parts, brake drums and the like by means of a series of bolts arranged'in a circle around the axis of rotation is also well'known in many constructions. I

The object of the present invention is to provide improved means for mounting one,

part upon another in such a manner that both the rotational engagement and centering r or positioning of the parts is efiected.

The invention consists in a device for mounting a large diameter element upon, and

so as to rotate in unison with, one of a smaller 7 diameter according to which a hollow conical or other tapering central region formed in the large diameter element is held between two complementary tapering abutments on separable parts of the smaller diameter element and the torsional forces are resisted by 39 the friction and interengaging projections and recesses of the two elements, or by friction only.

The invention further consists in a device as indicated in which a large diameter ele-' ment such as a brake drum is provided with a frusto-conical or other tapering centrally perforated shell of limited thickness which is gripped between complementary internal and external regions of two sleeved elements such 0 as the two separable parts of a demountable wheel hub construction.

The invention further consists in a device in accordance with either of the preceding paragraphs in which a central perforation is 5 provided around its edge with teeth or the like adapted to engage serrations formed in a cylindrical or like region which passes through the central perforation.

The invention further conslsts in a device as indicated in the preceding paragraphs in vided at its smaller diameter end with a cylinelement or hub part is provided with helical which a central perforation is provided around its edge wit a scre'y thread of suitable dimensions adapted to on age with asimilar external thread on 9. cy indrical or like region which passes through the central perforation. Y

The invention further consists in a device of the type indicated in which ositive drivmg means such as serrations an teeth or corrugations are provided on the interengaging surfaces of the frusto-conical regions.

The invention further consists in ade'vice as indicated in which the central shell of the larger diameter element or brake drum is prodrical region having suitable serrations, projections or like means for engagin with complementary surfaces on the sma 1 diameter region or inner hub part passing therethrough and on the larger diameter sleeved element or outer hub part.

The invention further consists in a device as indicated'in which a separate screwed and serrated belt is provided on the inner sleeved element or hub part, said'belt having a diameter somewhat greater than that of the cylindrical portion of said sleeved element, the central perforation of the large diameter or brake drum element fitting over and engaging with said belt and a circular nut being pro so vided for retaining said large diameter ele ment in position. The invention also consists in a device of the type indicated in which the outer sleeved serrations, inclined surfaces or'the like for engaging complementary serrations or the like on the inner sleeved elementor hub part and/or the large diameter or brake-drum element. v I

The invention also consists in improvements in or relating to rotational devices such as vehicle wheels as hereinafter described.

Referring now to the accompanying drawmgs:- Figure 1 shows a longitudinal section of the upper half of a detachable wheel hub of the wire-sp ked ype it a b ake drum 1 element retained in accordance with the present invention; 1

Figures 2, 3 and 4 are modifications of the above;

. of the above-mentioned patents;

Figures 9 and 9 show a modification of the form illustrated in Figure 7 also embodyin other engaging means.

11 carrying the invention into effect in one convenient form as illustrated in Figure 1, the two hub parts a, a of a demountable wheel hub construction are, formed so as to engage one another in their outer regions by means of complementary serrated cylindrical surfaces 1) and upon their inner regions are provided with frusto-conical belts a, 0 the surfaces of which are complementary to one another.

The frusto-conical belts although of complementary conicity are of such dimensions that they do not contact with one another when the outer hub is in its correct position upon the inner hub and a. space of conical form of say about. 1/20 to of an inch in thickness throughout is left between the two complementary. belts.

A brake drum d'for use with a hub construction of this kind is drawn up in the center into a frusto-conical shell 6 which may be about *1/20 of an inch in thickness in a steel construction. This central shell is provided with a concentric aperture or perforation of the same diameter as the serrated cylindrical portions of the two hub parts, serrations f being also formed around the edge of this central perforation so as to engage the teeth of the inner hub part.

The brake drum element d is placed upon the inner hub part a so that its interior engages with'the frusto-conical region 0 at the inner end thereof, the outer hub part a being then slid on to the inner hub part in the usual manner until its complementary frustoconical belt c'contacts with the exterior of the central shell e of the brake drum ele ment and holds the brake drum (1 securely in position and in connection withthe inner and outer wheel hub parts; 7 As shownin Figure 3 it may be convenient in some cases to provide one or more screws 8 which pass through the thickness of the -central shell e of the brake drum (1 and are screwed into tapped holes in and normal to the frusto-conical belt a of the inner hub allow or the greater thickness of the central greater, say about A of an inch, to

shell 6 of the aluminium brake drum element d. In other cases as shown in Figures 3 and 4 a the band or large diameter cylindrical portion 9 of the brake drum alone may be formed of aluminium with a steel or other suitable lining h for the rubbing surface, the band 9 being provided with an inturned flange g of any desired width which may be connected around its inner edge by means of a series .of bolts or rivets j with a flange k of'suitable proportions formed around the inner end of the central steel shell e which is gripped between the two hub parts. a

In constructions such as described in the previous paragraphs the ring of bolts or rivets may be ositioned closel adjacent to the band of the rake drum as s own in Figure 4 so that only a very narrow internal flange g is formed'thereon and a large diameter flange k on the inner end of the steel central shell element 0 or, brake drum band may be formed with a wider'flange g and a narrow flange 70 only be provided upon the steel shell e.

as illustrated in Figure 3, the

Instead of the serrations f engaging the or- I dinary driving serrations b of the 1nner hub p'art a a separate serrated belt I as illustrated in Figure 5 of somewhat larger diamof the brake drumd and thereby to hold it 1n position upon the inner hub part irrespec tive of the grippin action of the conical portion a of the outer fiub part a, the nut n being formedupon its outer side to follow the contour of the frusto-conical region 0 of the inner hub part 011 and the outer hub part beinformed complementary to both the nut n and the external surface of the central shell e on the brake drum element.

' In a further modification shown in Figure 6, the frusto-conical central shell of the brake drum is provided with an adjacent cylindrical region 0 at its smaller diameter end in order togive a greater. length of teeth f for engaging the serrated portion 6 than the vehicle runnin wouldv be provided by serrations extending only across the oblique thickness of the material as shown in the foregoing figures. In this case the outer hub part is rovid'ed with a suitable bulge t for accommo ating the said cylindrical portion of the central shell.

Instead of providing serrations in the wall of the central perforation of the brake drum element as described with reference to Figures 1 to 6 inclusive, a suitable screw thread may be provided which is preferabl chosen of such a hand as will ensure that t ,e brake drum tends to screw up against the inner hub part. rather than unscrew against the outer hub part when the .brake is a plied with in a forwar direction, such application being the most frequent and generally the most severe.

In some instances the frictional grip of the frusto-conical region may be. suflicient to transmit the rotational forces or torque without any interengagi'ng serrations and teeth'or screwed portions being provided for this purpose.

In Figure 7, a suitable alternative structure is shown, the surfaces of the frusto-coni- -cal belts 0, e, 0 themselves being made of a waved or corrugated contouraround the circumferential surface. This wavlng or corrugating is illustrated in .Figure 7 which shows a section on the line 88 of Figure 7. The waves or corrugations are provided both on the exterior region of the frusto-conical part c of the inner hub part and on the interior region of the frusto-conical part 0 of the outer hub part, and the tapering central shell part 0 of the brakedr'um element is also 'corrugated or waved so as to be complementary to the other two surfaces.

A further modification is shown in Figure 8 of the accompanying drawings. The outer end of the outer or wheel hub part a is provided with suitable helical serrations b the inner engaging frusto-conical regions 0, e, c of the outer hub part a, the brake drum shell d and the inner hub part a respectively being provided with complementary buttress serrations and teeth 12 of the shape similar to those shown in the previously-mentioned Patent No. 1,609,675. These buttress serrations and teeth are provided both on the outer surface of the central shell 0 of the brake drum (1 and on its inner surface to engage complementary serrations on the outer and inner hub parts respectively.

In the modification illustrated in Figure 9, plain serrations or helical serrations may be employed. The outer hub part a and the inner hub part a are provided with complementary serrations on their cylindrical por tions at, b. Corrugations are provided as shown on the outer hub frusto-conical portion a and engage internally with the external surfaces ofcorrugations on the brake 'drum frusto-conical portion 6 the internal in Figure9, one side of t e corrugation on the interior of the outer hub part at c pinches or grips the corrugations on the brake drum central shell e against one side of the waves on the inner hub frusto-conical portion 0 which elimination of rotational slackness may be efl'ectedgither by the circumferential relationship of the serrations and corrugar tions or by the provision of helical serrations.

In one or more of the foregoing modifications of the invention, the frusto-conical cen-. tral shell of the. brake drum may be split at one or more locations in a plane or planes con-' taining the axis of the cone, such splitting enabling a closer fit of the contacting surfaces to be obtained without paying so much attention to the accuracy of their form.

In one or more of the before-mentioned patents, taperingregions of multi-sided form lave been employed for transmitting the torque between inner and outer hub parts and it is to be understood that a central shell of a brake drum in accordance with this invention may be formed so as to be complementary to any interengaging surfaces of this descri tion. Y r 7 Alt ough described and illustrated in connection with brake drum elements, it is to be understood that the invention may be applied to other large diameter eleme ts which are fitted upon smaller ones and t at the constructions hereinbefore described ai'e given by way of example and that further, modification s and additions may be introduced without in any way departing from the spirit of this invention.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is 1. In combination in a rotational device, an inner hub member having a frusto-conical portion, an outer hub member having likewise a frusto-conical portion, a brake member having a frusto-conical portion and means for ripping said frusto-conical portion of said rake member between said first-mentioned and said second-mentioned frustoconical portions.

2. In combination in a rotational device, an inner hub member having a frusto-conical portion, an outer hub member having a frusto-conical portion, and a brake drum having a frusto-conical portion operatively dis- 5 portions, said first-, secondand third-mentioned frusto-conical portions having a belt of linterengaging means associated therewit 5. In combination in a rotational device,

an inner hub member having a frusto-conical portion, an outer hub member having likewise a frusto-conical portion, a brake member having a frusto-corii'cal portion operatively disposed between said first-mentioned and said second-mentioned frusto-conical portions, said first-, secondand third-mention'ed frusto-conical portions having a belt of interengaging corrugations and other interengaging means on said inner and outer 3 hub members, said other intereng'aging means by their locationrelative to said corrugations causing saidjcorrugations operatively to engage on only one side.

In testimony whereof we have signed our names to this specification.

JOHN VERNON PUGH.

G. T. BAYLISS. 1

v I cmmm 0F. CORRECTION.

Y Patent No. 1,737, 332. Granted November 26, 1929, to I 101m VERNON PUGH ET AL. I

It ishereby certified that the name of the assignee in the above numbered patent was erroneously written and printed as "Ridge-Whitworth, Limited", whereas t1- sald name should have been written and printed as "Rudg e-Whitworth, Limited", as shown .by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that 'the same may conform tothe recoil of the case in thePatent Office. Q

Signed and sealed this 4th day of February, A. D. 1930. so

I M. J. Moore, (Seal) 7 Acting Commissioner of Patents. 

